[457] | 1 | /**
|
---|
| 2 | * @file
|
---|
| 3 | * Application layered TCP/TLS connection API (to be used from TCPIP thread)
|
---|
| 4 | *
|
---|
| 5 | * This file provides a TLS layer using mbedTLS
|
---|
| 6 | */
|
---|
| 7 |
|
---|
| 8 | /*
|
---|
| 9 | * Copyright (c) 2017 Simon Goldschmidt
|
---|
| 10 | * All rights reserved.
|
---|
| 11 | *
|
---|
| 12 | * Redistribution and use in source and binary forms, with or without modification,
|
---|
| 13 | * are permitted provided that the following conditions are met:
|
---|
| 14 | *
|
---|
| 15 | * 1. Redistributions of source code must retain the above copyright notice,
|
---|
| 16 | * this list of conditions and the following disclaimer.
|
---|
| 17 | * 2. Redistributions in binary form must reproduce the above copyright notice,
|
---|
| 18 | * this list of conditions and the following disclaimer in the documentation
|
---|
| 19 | * and/or other materials provided with the distribution.
|
---|
| 20 | * 3. The name of the author may not be used to endorse or promote products
|
---|
| 21 | * derived from this software without specific prior written permission.
|
---|
| 22 | *
|
---|
| 23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
---|
| 24 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
---|
| 25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
|
---|
| 26 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
---|
| 27 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
|
---|
| 28 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
---|
| 29 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
---|
| 30 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
---|
| 31 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
|
---|
| 32 | * OF SUCH DAMAGE.
|
---|
| 33 | *
|
---|
| 34 | * This file is part of the lwIP TCP/IP stack.
|
---|
| 35 | *
|
---|
| 36 | * Author: Simon Goldschmidt <goldsimon@gmx.de>
|
---|
| 37 | *
|
---|
| 38 | * Watch out:
|
---|
| 39 | * - 'sent' is always called with len==0 to the upper layer. This is because keeping
|
---|
| 40 | * track of the ratio of application data and TLS overhead would be too much.
|
---|
| 41 | *
|
---|
| 42 | * Mandatory security-related configuration:
|
---|
| 43 | * - define ALTCP_MBEDTLS_RNG_FN to mbedtls_entropy_func to use the standard mbedTLS
|
---|
| 44 | * entropy and ensure to add at least one strong entropy source to your mbedtls port
|
---|
| 45 | * (implement mbedtls_platform_entropy_poll or mbedtls_hardware_poll providing strong
|
---|
| 46 | * entropy)
|
---|
| 47 | * - define ALTCP_MBEDTLS_ENTROPY_PTR and ALTCP_MBEDTLS_ENTROPY_LEN to something providing
|
---|
| 48 | * GOOD custom entropy
|
---|
| 49 | *
|
---|
| 50 | * Missing things / @todo:
|
---|
| 51 | * - some unhandled/untested things migh be caught by LWIP_ASSERTs...
|
---|
| 52 | */
|
---|
| 53 |
|
---|
| 54 | #include "lwip/opt.h"
|
---|
| 55 |
|
---|
| 56 | #if LWIP_ALTCP /* don't build if not configured for use in lwipopts.h */
|
---|
| 57 |
|
---|
| 58 | #include "lwip/apps/altcp_tls_mbedtls_opts.h"
|
---|
| 59 |
|
---|
| 60 | #if LWIP_ALTCP_TLS && LWIP_ALTCP_TLS_MBEDTLS
|
---|
| 61 |
|
---|
| 62 | #include "lwip/altcp.h"
|
---|
| 63 | #include "lwip/altcp_tls.h"
|
---|
| 64 | #include "lwip/priv/altcp_priv.h"
|
---|
| 65 |
|
---|
| 66 | #include "altcp_tls_mbedtls_structs.h"
|
---|
| 67 | #include "altcp_tls_mbedtls_mem.h"
|
---|
| 68 |
|
---|
| 69 | /* @todo: which includes are really needed? */
|
---|
| 70 | #include "mbedtls/entropy.h"
|
---|
| 71 | #include "mbedtls/ctr_drbg.h"
|
---|
| 72 | #include "mbedtls/certs.h"
|
---|
| 73 | #include "mbedtls/x509.h"
|
---|
| 74 | #include "mbedtls/ssl.h"
|
---|
| 75 | #include "mbedtls/net.h"
|
---|
| 76 | #include "mbedtls/error.h"
|
---|
| 77 | #include "mbedtls/debug.h"
|
---|
| 78 | #include "mbedtls/platform.h"
|
---|
| 79 | #include "mbedtls/memory_buffer_alloc.h"
|
---|
| 80 | #include "mbedtls/ssl_cache.h"
|
---|
| 81 |
|
---|
| 82 | #include "mbedtls/ssl_internal.h" /* to call mbedtls_flush_output after ERR_MEM */
|
---|
| 83 |
|
---|
| 84 | #include <string.h>
|
---|
| 85 |
|
---|
| 86 | #ifndef ALTCP_MBEDTLS_ENTROPY_PTR
|
---|
| 87 | #define ALTCP_MBEDTLS_ENTROPY_PTR NULL
|
---|
| 88 | #endif
|
---|
| 89 | #ifndef ALTCP_MBEDTLS_ENTROPY_LEN
|
---|
| 90 | #define ALTCP_MBEDTLS_ENTROPY_LEN 0
|
---|
| 91 | #endif
|
---|
| 92 |
|
---|
| 93 | /* Variable prototype, the actual declaration is at the end of this file
|
---|
| 94 | since it contains pointers to static functions declared here */
|
---|
| 95 | extern const struct altcp_functions altcp_mbedtls_functions;
|
---|
| 96 |
|
---|
| 97 | /** Our global mbedTLS configuration (server-specific, not connection-specific) */
|
---|
| 98 | struct altcp_tls_config {
|
---|
| 99 | mbedtls_ssl_config conf;
|
---|
| 100 | mbedtls_entropy_context entropy;
|
---|
| 101 | mbedtls_ctr_drbg_context ctr_drbg;
|
---|
| 102 | mbedtls_x509_crt *cert;
|
---|
| 103 | mbedtls_pk_context *pkey;
|
---|
| 104 | mbedtls_x509_crt *ca;
|
---|
| 105 | #if defined(MBEDTLS_SSL_CACHE_C) && ALTCP_MBEDTLS_SESSION_CACHE_TIMEOUT_SECONDS
|
---|
| 106 | /** Inter-connection cache for fast connection startup */
|
---|
| 107 | struct mbedtls_ssl_cache_context cache;
|
---|
| 108 | #endif
|
---|
| 109 | };
|
---|
| 110 |
|
---|
| 111 | static err_t altcp_mbedtls_lower_recv(void *arg, struct altcp_pcb *inner_conn, struct pbuf *p, err_t err);
|
---|
| 112 | static err_t altcp_mbedtls_setup(void *conf, struct altcp_pcb *conn, struct altcp_pcb *inner_conn);
|
---|
| 113 | static err_t altcp_mbedtls_lower_recv_process(struct altcp_pcb *conn, altcp_mbedtls_state_t *state);
|
---|
| 114 | static err_t altcp_mbedtls_handle_rx_appldata(struct altcp_pcb *conn, altcp_mbedtls_state_t *state);
|
---|
| 115 | static int altcp_mbedtls_bio_send(void *ctx, const unsigned char *dataptr, size_t size);
|
---|
| 116 |
|
---|
| 117 |
|
---|
| 118 | /* callback functions from inner/lower connection: */
|
---|
| 119 |
|
---|
| 120 | /** Accept callback from lower connection (i.e. TCP)
|
---|
| 121 | * Allocate one of our structures, assign it to the new connection's 'state' and
|
---|
| 122 | * call the new connection's 'accepted' callback. If that succeeds, we wait
|
---|
| 123 | * to receive connection setup handshake bytes from the client.
|
---|
| 124 | */
|
---|
| 125 | static err_t
|
---|
| 126 | altcp_mbedtls_lower_accept(void *arg, struct altcp_pcb *accepted_conn, err_t err)
|
---|
| 127 | {
|
---|
| 128 | struct altcp_pcb *listen_conn = (struct altcp_pcb *)arg;
|
---|
| 129 | if (listen_conn && listen_conn->state && listen_conn->accept) {
|
---|
| 130 | err_t setup_err;
|
---|
| 131 | altcp_mbedtls_state_t *listen_state = (altcp_mbedtls_state_t *)listen_conn->state;
|
---|
| 132 | /* create a new altcp_conn to pass to the next 'accept' callback */
|
---|
| 133 | struct altcp_pcb *new_conn = altcp_alloc();
|
---|
| 134 | if (new_conn == NULL) {
|
---|
| 135 | return ERR_MEM;
|
---|
| 136 | }
|
---|
| 137 | setup_err = altcp_mbedtls_setup(listen_state->conf, new_conn, accepted_conn);
|
---|
| 138 | if (setup_err != ERR_OK) {
|
---|
| 139 | altcp_free(new_conn);
|
---|
| 140 | return setup_err;
|
---|
| 141 | }
|
---|
| 142 | return listen_conn->accept(listen_conn->arg, new_conn, err);
|
---|
| 143 | }
|
---|
| 144 | return ERR_ARG;
|
---|
| 145 | }
|
---|
| 146 |
|
---|
| 147 | /** Connected callback from lower connection (i.e. TCP).
|
---|
| 148 | * Not really implemented/tested yet...
|
---|
| 149 | */
|
---|
| 150 | static err_t
|
---|
| 151 | altcp_mbedtls_lower_connected(void *arg, struct altcp_pcb *inner_conn, err_t err)
|
---|
| 152 | {
|
---|
| 153 | struct altcp_pcb *conn = (struct altcp_pcb *)arg;
|
---|
| 154 | LWIP_UNUSED_ARG(inner_conn); /* for LWIP_NOASSERT */
|
---|
| 155 | if (conn && conn->state) {
|
---|
| 156 | LWIP_ASSERT("pcb mismatch", conn->inner_conn == inner_conn);
|
---|
| 157 | /* upper connected is called when handshake is done */
|
---|
| 158 | if (err != ERR_OK) {
|
---|
| 159 | if (conn->connected) {
|
---|
| 160 | return conn->connected(conn->arg, conn, err);
|
---|
| 161 | }
|
---|
| 162 | }
|
---|
| 163 | return altcp_mbedtls_lower_recv_process(conn, (altcp_mbedtls_state_t *)conn->state);
|
---|
| 164 | }
|
---|
| 165 | return ERR_VAL;
|
---|
| 166 | }
|
---|
| 167 |
|
---|
| 168 | /* Call recved for possibly more than an u16_t */
|
---|
| 169 | static void
|
---|
| 170 | altcp_mbedtls_lower_recved(struct altcp_pcb *inner_conn, int recvd_cnt)
|
---|
| 171 | {
|
---|
| 172 | while (recvd_cnt > 0) {
|
---|
| 173 | u16_t recvd_part = (u16_t)LWIP_MIN(recvd_cnt, 0xFFFF);
|
---|
| 174 | altcp_recved(inner_conn, recvd_part);
|
---|
| 175 | recvd_cnt -= recvd_part;
|
---|
| 176 | }
|
---|
| 177 | }
|
---|
| 178 |
|
---|
| 179 | /** Recv callback from lower connection (i.e. TCP)
|
---|
| 180 | * This one mainly differs between connection setup/handshake (data is fed into mbedTLS only)
|
---|
| 181 | * and application phase (data is decoded by mbedTLS and passed on to the application).
|
---|
| 182 | */
|
---|
| 183 | static err_t
|
---|
| 184 | altcp_mbedtls_lower_recv(void *arg, struct altcp_pcb *inner_conn, struct pbuf *p, err_t err)
|
---|
| 185 | {
|
---|
| 186 | altcp_mbedtls_state_t *state;
|
---|
| 187 | struct altcp_pcb *conn = (struct altcp_pcb *)arg;
|
---|
| 188 |
|
---|
| 189 | LWIP_ASSERT("no err expected", err == ERR_OK);
|
---|
| 190 | LWIP_UNUSED_ARG(err);
|
---|
| 191 |
|
---|
| 192 | if (!conn) {
|
---|
| 193 | /* no connection given as arg? should not happen, but prevent pbuf/conn leaks */
|
---|
| 194 | if (p != NULL) {
|
---|
| 195 | pbuf_free(p);
|
---|
| 196 | }
|
---|
| 197 | altcp_close(inner_conn);
|
---|
| 198 | return ERR_CLSD;
|
---|
| 199 | }
|
---|
| 200 | state = (altcp_mbedtls_state_t *)conn->state;
|
---|
| 201 | LWIP_ASSERT("pcb mismatch", conn->inner_conn == inner_conn);
|
---|
| 202 | if (!state) {
|
---|
| 203 | /* already closed */
|
---|
| 204 | if (p != NULL) {
|
---|
| 205 | pbuf_free(p);
|
---|
| 206 | }
|
---|
| 207 | altcp_close(inner_conn);
|
---|
| 208 | return ERR_CLSD;
|
---|
| 209 | }
|
---|
| 210 |
|
---|
| 211 | /* handle NULL pbuf (inner connection closed) */
|
---|
| 212 | if (p == NULL) {
|
---|
| 213 | /* remote host sent FIN, remember this (SSL state is destroyed
|
---|
| 214 | when both sides are closed only!) */
|
---|
| 215 | if ((state->flags & (ALTCP_MBEDTLS_FLAGS_HANDSHAKE_DONE | ALTCP_MBEDTLS_FLAGS_UPPER_CALLED)) ==
|
---|
| 216 | (ALTCP_MBEDTLS_FLAGS_HANDSHAKE_DONE | ALTCP_MBEDTLS_FLAGS_UPPER_CALLED)) {
|
---|
| 217 | /* need to notify upper layer (e.g. 'accept' called or 'connect' succeeded) */
|
---|
| 218 | if ((state->rx != NULL) || (state->rx_app != NULL)) {
|
---|
| 219 | state->flags |= ALTCP_MBEDTLS_FLAGS_RX_CLOSE_QUEUED;
|
---|
| 220 | /* this is a normal close (FIN) but we have unprocessed data, so delay the FIN */
|
---|
| 221 | altcp_mbedtls_handle_rx_appldata(conn, state);
|
---|
| 222 | return ERR_OK;
|
---|
| 223 | }
|
---|
| 224 | state->flags |= ALTCP_MBEDTLS_FLAGS_RX_CLOSED;
|
---|
| 225 | if (conn->recv) {
|
---|
| 226 | return conn->recv(conn->arg, conn, NULL, ERR_OK);
|
---|
| 227 | }
|
---|
| 228 | } else {
|
---|
| 229 | /* before connection setup is done: call 'err' */
|
---|
| 230 | if (conn->err) {
|
---|
| 231 | conn->err(conn->arg, ERR_CLSD);
|
---|
| 232 | }
|
---|
| 233 | altcp_close(conn);
|
---|
| 234 | }
|
---|
| 235 | return ERR_OK;
|
---|
| 236 | }
|
---|
| 237 |
|
---|
| 238 | /* If we come here, the connection is in good state (handshake phase or application data phase).
|
---|
| 239 | Queue up the pbuf for processing as handshake data or application data. */
|
---|
| 240 | if (state->rx == NULL) {
|
---|
| 241 | state->rx = p;
|
---|
| 242 | } else {
|
---|
| 243 | LWIP_ASSERT("rx pbuf overflow", (int)p->tot_len + (int)p->len <= 0xFFFF);
|
---|
| 244 | pbuf_cat(state->rx, p);
|
---|
| 245 | }
|
---|
| 246 | return altcp_mbedtls_lower_recv_process(conn, state);
|
---|
| 247 | }
|
---|
| 248 |
|
---|
| 249 | static err_t
|
---|
| 250 | altcp_mbedtls_lower_recv_process(struct altcp_pcb *conn, altcp_mbedtls_state_t *state)
|
---|
| 251 | {
|
---|
| 252 | if (!(state->flags & ALTCP_MBEDTLS_FLAGS_HANDSHAKE_DONE)) {
|
---|
| 253 | /* handle connection setup (handshake not done) */
|
---|
| 254 | int ret = mbedtls_ssl_handshake(&state->ssl_context);
|
---|
| 255 | /* try to send data... */
|
---|
| 256 | altcp_output(conn->inner_conn);
|
---|
| 257 | if (state->bio_bytes_read) {
|
---|
| 258 | /* acknowledge all bytes read */
|
---|
| 259 | altcp_mbedtls_lower_recved(conn->inner_conn, state->bio_bytes_read);
|
---|
| 260 | state->bio_bytes_read = 0;
|
---|
| 261 | }
|
---|
| 262 |
|
---|
| 263 | if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
|
---|
| 264 | /* handshake not done, wait for more recv calls */
|
---|
| 265 | LWIP_ASSERT("in this state, the rx chain should be empty", state->rx == NULL);
|
---|
| 266 | return ERR_OK;
|
---|
| 267 | }
|
---|
| 268 | if (ret != 0) {
|
---|
| 269 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("mbedtls_ssl_handshake failed: %d\n", ret));
|
---|
| 270 | /* handshake failed, connection has to be closed */
|
---|
| 271 | if (conn->err) {
|
---|
| 272 | conn->err(conn->arg, ERR_CLSD);
|
---|
| 273 | }
|
---|
| 274 |
|
---|
| 275 | if (altcp_close(conn) != ERR_OK) {
|
---|
| 276 | altcp_abort(conn);
|
---|
| 277 | }
|
---|
| 278 | return ERR_OK;
|
---|
| 279 | }
|
---|
| 280 | /* If we come here, handshake succeeded. */
|
---|
| 281 | LWIP_ASSERT("state", state->bio_bytes_read == 0);
|
---|
| 282 | LWIP_ASSERT("state", state->bio_bytes_appl == 0);
|
---|
| 283 | state->flags |= ALTCP_MBEDTLS_FLAGS_HANDSHAKE_DONE;
|
---|
| 284 | /* issue "connect" callback" to upper connection (this can only happen for active open) */
|
---|
| 285 | if (conn->connected) {
|
---|
| 286 | err_t err;
|
---|
| 287 | err = conn->connected(conn->arg, conn, ERR_OK);
|
---|
| 288 | if (err != ERR_OK) {
|
---|
| 289 | return err;
|
---|
| 290 | }
|
---|
| 291 | }
|
---|
| 292 | if (state->rx == NULL) {
|
---|
| 293 | return ERR_OK;
|
---|
| 294 | }
|
---|
| 295 | }
|
---|
| 296 | /* handle application data */
|
---|
| 297 | return altcp_mbedtls_handle_rx_appldata(conn, state);
|
---|
| 298 | }
|
---|
| 299 |
|
---|
| 300 | /* Pass queued decoded rx data to application */
|
---|
| 301 | static err_t
|
---|
| 302 | altcp_mbedtls_pass_rx_data(struct altcp_pcb *conn, altcp_mbedtls_state_t *state)
|
---|
| 303 | {
|
---|
| 304 | err_t err;
|
---|
| 305 | struct pbuf *buf;
|
---|
| 306 | LWIP_ASSERT("conn != NULL", conn != NULL);
|
---|
| 307 | LWIP_ASSERT("state != NULL", state != NULL);
|
---|
| 308 | buf = state->rx_app;
|
---|
| 309 | if (buf) {
|
---|
| 310 | state->rx_app = NULL;
|
---|
| 311 | if (conn->recv) {
|
---|
| 312 | u16_t tot_len = buf->tot_len;
|
---|
| 313 | /* this needs to be increased first because the 'recved' call may come nested */
|
---|
| 314 | state->rx_passed_unrecved += tot_len;
|
---|
| 315 | state->flags |= ALTCP_MBEDTLS_FLAGS_UPPER_CALLED;
|
---|
| 316 | err = conn->recv(conn->arg, conn, buf, ERR_OK);
|
---|
| 317 | if (err != ERR_OK) {
|
---|
| 318 | if (err == ERR_ABRT) {
|
---|
| 319 | return ERR_ABRT;
|
---|
| 320 | }
|
---|
| 321 | /* not received, leave the pbuf(s) queued (and decrease 'unrecved' again) */
|
---|
| 322 | LWIP_ASSERT("state == conn->state", state == conn->state);
|
---|
| 323 | state->rx_app = buf;
|
---|
| 324 | state->rx_passed_unrecved -= tot_len;
|
---|
| 325 | LWIP_ASSERT("state->rx_passed_unrecved >= 0", state->rx_passed_unrecved >= 0);
|
---|
| 326 | if (state->rx_passed_unrecved < 0) {
|
---|
| 327 | state->rx_passed_unrecved = 0;
|
---|
| 328 | }
|
---|
| 329 | return err;
|
---|
| 330 | }
|
---|
| 331 | } else {
|
---|
| 332 | pbuf_free(buf);
|
---|
| 333 | }
|
---|
| 334 | } else if ((state->flags & (ALTCP_MBEDTLS_FLAGS_RX_CLOSE_QUEUED | ALTCP_MBEDTLS_FLAGS_RX_CLOSED)) ==
|
---|
| 335 | ALTCP_MBEDTLS_FLAGS_RX_CLOSE_QUEUED) {
|
---|
| 336 | state->flags |= ALTCP_MBEDTLS_FLAGS_RX_CLOSED;
|
---|
| 337 | if (conn->recv) {
|
---|
| 338 | return conn->recv(conn->arg, conn, NULL, ERR_OK);
|
---|
| 339 | }
|
---|
| 340 | }
|
---|
| 341 |
|
---|
| 342 | /* application may have close the connection */
|
---|
| 343 | if (conn->state != state) {
|
---|
| 344 | /* return error code to ensure altcp_mbedtls_handle_rx_appldata() exits the loop */
|
---|
| 345 | return ERR_CLSD;
|
---|
| 346 | }
|
---|
| 347 | return ERR_OK;
|
---|
| 348 | }
|
---|
| 349 |
|
---|
| 350 | /* Helper function that processes rx application data stored in rx pbuf chain */
|
---|
| 351 | static err_t
|
---|
| 352 | altcp_mbedtls_handle_rx_appldata(struct altcp_pcb *conn, altcp_mbedtls_state_t *state)
|
---|
| 353 | {
|
---|
| 354 | int ret;
|
---|
| 355 | LWIP_ASSERT("state != NULL", state != NULL);
|
---|
| 356 | if (!(state->flags & ALTCP_MBEDTLS_FLAGS_HANDSHAKE_DONE)) {
|
---|
| 357 | /* handshake not done yet */
|
---|
| 358 | return ERR_VAL;
|
---|
| 359 | }
|
---|
| 360 | do {
|
---|
| 361 | /* allocate a full-sized unchained PBUF_POOL: this is for RX! */
|
---|
| 362 | struct pbuf *buf = pbuf_alloc(PBUF_RAW, PBUF_POOL_BUFSIZE, PBUF_POOL);
|
---|
| 363 | if (buf == NULL) {
|
---|
| 364 | /* We're short on pbufs, try again later from 'poll' or 'recv' callbacks.
|
---|
| 365 | @todo: close on excessive allocation failures or leave this up to upper conn? */
|
---|
| 366 | return ERR_OK;
|
---|
| 367 | }
|
---|
| 368 |
|
---|
| 369 | /* decrypt application data, this pulls encrypted RX data off state->rx pbuf chain */
|
---|
| 370 | ret = mbedtls_ssl_read(&state->ssl_context, (unsigned char *)buf->payload, PBUF_POOL_BUFSIZE);
|
---|
| 371 | if (ret < 0) {
|
---|
| 372 | if (ret == MBEDTLS_ERR_SSL_CLIENT_RECONNECT) {
|
---|
| 373 | /* client is initiating a new connection using the same source port -> close connection or make handshake */
|
---|
| 374 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("new connection on same source port\n"));
|
---|
| 375 | LWIP_ASSERT("TODO: new connection on same source port, close this connection", 0);
|
---|
| 376 | } else if ((ret != MBEDTLS_ERR_SSL_WANT_READ) && (ret != MBEDTLS_ERR_SSL_WANT_WRITE)) {
|
---|
| 377 | if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
|
---|
| 378 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("connection was closed gracefully\n"));
|
---|
| 379 | } else if (ret == MBEDTLS_ERR_NET_CONN_RESET) {
|
---|
| 380 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("connection was reset by peer\n"));
|
---|
| 381 | }
|
---|
| 382 | pbuf_free(buf);
|
---|
| 383 | return ERR_OK;
|
---|
| 384 | } else {
|
---|
| 385 | pbuf_free(buf);
|
---|
| 386 | return ERR_OK;
|
---|
| 387 | }
|
---|
| 388 | pbuf_free(buf);
|
---|
| 389 | altcp_abort(conn);
|
---|
| 390 | return ERR_ABRT;
|
---|
| 391 | } else {
|
---|
| 392 | err_t err;
|
---|
| 393 | if (ret) {
|
---|
| 394 | LWIP_ASSERT("bogus receive length", ret <= PBUF_POOL_BUFSIZE);
|
---|
| 395 | /* trim pool pbuf to actually decoded length */
|
---|
| 396 | pbuf_realloc(buf, (u16_t)ret);
|
---|
| 397 |
|
---|
| 398 | state->bio_bytes_appl += ret;
|
---|
| 399 | if (mbedtls_ssl_get_bytes_avail(&state->ssl_context) == 0) {
|
---|
| 400 | /* Record is done, now we know the share between application and protocol bytes
|
---|
| 401 | and can adjust the RX window by the protocol bytes.
|
---|
| 402 | The rest is 'recved' by the application calling our 'recved' fn. */
|
---|
| 403 | int overhead_bytes;
|
---|
| 404 | LWIP_ASSERT("bogus byte counts", state->bio_bytes_read > state->bio_bytes_appl);
|
---|
| 405 | overhead_bytes = state->bio_bytes_read - state->bio_bytes_appl;
|
---|
| 406 | altcp_mbedtls_lower_recved(conn->inner_conn, overhead_bytes);
|
---|
| 407 | state->bio_bytes_read = 0;
|
---|
| 408 | state->bio_bytes_appl = 0;
|
---|
| 409 | }
|
---|
| 410 |
|
---|
| 411 | if (state->rx_app == NULL) {
|
---|
| 412 | state->rx_app = buf;
|
---|
| 413 | } else {
|
---|
| 414 | pbuf_cat(state->rx_app, buf);
|
---|
| 415 | }
|
---|
| 416 | } else {
|
---|
| 417 | pbuf_free(buf);
|
---|
| 418 | buf = NULL;
|
---|
| 419 | }
|
---|
| 420 | err = altcp_mbedtls_pass_rx_data(conn, state);
|
---|
| 421 | if (err != ERR_OK) {
|
---|
| 422 | if (err == ERR_ABRT) {
|
---|
| 423 | /* recv callback needs to return this as the pcb is deallocated */
|
---|
| 424 | return ERR_ABRT;
|
---|
| 425 | }
|
---|
| 426 | /* we hide all other errors as we retry feeding the pbuf to the app later */
|
---|
| 427 | return ERR_OK;
|
---|
| 428 | }
|
---|
| 429 | }
|
---|
| 430 | } while (ret > 0);
|
---|
| 431 | return ERR_OK;
|
---|
| 432 | }
|
---|
| 433 |
|
---|
| 434 | /** Receive callback function called from mbedtls (set via mbedtls_ssl_set_bio)
|
---|
| 435 | * This function mainly copies data from pbufs and frees the pbufs after copying.
|
---|
| 436 | */
|
---|
| 437 | static int
|
---|
| 438 | altcp_mbedtls_bio_recv(void *ctx, unsigned char *buf, size_t len)
|
---|
| 439 | {
|
---|
| 440 | struct altcp_pcb *conn = (struct altcp_pcb *)ctx;
|
---|
| 441 | altcp_mbedtls_state_t *state;
|
---|
| 442 | struct pbuf *p;
|
---|
| 443 | u16_t ret;
|
---|
| 444 | u16_t copy_len;
|
---|
| 445 | err_t err;
|
---|
| 446 |
|
---|
| 447 | LWIP_UNUSED_ARG(err); /* for LWIP_NOASSERT */
|
---|
| 448 | if ((conn == NULL) || (conn->state == NULL)) {
|
---|
| 449 | return MBEDTLS_ERR_NET_INVALID_CONTEXT;
|
---|
| 450 | }
|
---|
| 451 | state = (altcp_mbedtls_state_t *)conn->state;
|
---|
| 452 | p = state->rx;
|
---|
| 453 |
|
---|
| 454 | /* @todo: return MBEDTLS_ERR_NET_CONN_RESET/MBEDTLS_ERR_NET_RECV_FAILED? */
|
---|
| 455 |
|
---|
| 456 | if ((p == NULL) || ((p->len == 0) && (p->next == NULL))) {
|
---|
| 457 | if (p) {
|
---|
| 458 | pbuf_free(p);
|
---|
| 459 | }
|
---|
| 460 | state->rx = NULL;
|
---|
| 461 | if ((state->flags & (ALTCP_MBEDTLS_FLAGS_RX_CLOSE_QUEUED | ALTCP_MBEDTLS_FLAGS_RX_CLOSED)) ==
|
---|
| 462 | ALTCP_MBEDTLS_FLAGS_RX_CLOSE_QUEUED) {
|
---|
| 463 | /* close queued but not passed up yet */
|
---|
| 464 | return 0;
|
---|
| 465 | }
|
---|
| 466 | return MBEDTLS_ERR_SSL_WANT_READ;
|
---|
| 467 | }
|
---|
| 468 | /* limit number of bytes again to copy from first pbuf in a chain only */
|
---|
| 469 | copy_len = (u16_t)LWIP_MIN(len, p->len);
|
---|
| 470 | /* copy the data */
|
---|
| 471 | ret = pbuf_copy_partial(p, buf, copy_len, 0);
|
---|
| 472 | LWIP_ASSERT("ret == copy_len", ret == copy_len);
|
---|
| 473 | /* hide the copied bytes from the pbuf */
|
---|
| 474 | err = pbuf_remove_header(p, ret);
|
---|
| 475 | LWIP_ASSERT("error", err == ERR_OK);
|
---|
| 476 | if (p->len == 0) {
|
---|
| 477 | /* the first pbuf has been fully read, free it */
|
---|
| 478 | state->rx = p->next;
|
---|
| 479 | p->next = NULL;
|
---|
| 480 | pbuf_free(p);
|
---|
| 481 | }
|
---|
| 482 |
|
---|
| 483 | state->bio_bytes_read += (int)ret;
|
---|
| 484 | return ret;
|
---|
| 485 | }
|
---|
| 486 |
|
---|
| 487 | /** Sent callback from lower connection (i.e. TCP)
|
---|
| 488 | * This only informs the upper layer to try to send more, not about
|
---|
| 489 | * the number of ACKed bytes.
|
---|
| 490 | */
|
---|
| 491 | static err_t
|
---|
| 492 | altcp_mbedtls_lower_sent(void *arg, struct altcp_pcb *inner_conn, u16_t len)
|
---|
| 493 | {
|
---|
| 494 | struct altcp_pcb *conn = (struct altcp_pcb *)arg;
|
---|
| 495 | LWIP_UNUSED_ARG(inner_conn); /* for LWIP_NOASSERT */
|
---|
| 496 | LWIP_UNUSED_ARG(len);
|
---|
| 497 | if (conn) {
|
---|
| 498 | altcp_mbedtls_state_t *state = (altcp_mbedtls_state_t *)conn->state;
|
---|
| 499 | LWIP_ASSERT("pcb mismatch", conn->inner_conn == inner_conn);
|
---|
| 500 | if (!state || !(state->flags & ALTCP_MBEDTLS_FLAGS_HANDSHAKE_DONE)) {
|
---|
| 501 | /* @todo: do something here? */
|
---|
| 502 | return ERR_OK;
|
---|
| 503 | }
|
---|
| 504 | /* try to send more if we failed before */
|
---|
| 505 | mbedtls_ssl_flush_output(&state->ssl_context);
|
---|
| 506 | /* call upper sent with len==0 if the application already sent data */
|
---|
| 507 | if ((state->flags & ALTCP_MBEDTLS_FLAGS_APPLDATA_SENT) && conn->sent) {
|
---|
| 508 | return conn->sent(conn->arg, conn, 0);
|
---|
| 509 | }
|
---|
| 510 | }
|
---|
| 511 | return ERR_OK;
|
---|
| 512 | }
|
---|
| 513 |
|
---|
| 514 | /** Poll callback from lower connection (i.e. TCP)
|
---|
| 515 | * Just pass this on to the application.
|
---|
| 516 | * @todo: retry sending?
|
---|
| 517 | */
|
---|
| 518 | static err_t
|
---|
| 519 | altcp_mbedtls_lower_poll(void *arg, struct altcp_pcb *inner_conn)
|
---|
| 520 | {
|
---|
| 521 | struct altcp_pcb *conn = (struct altcp_pcb *)arg;
|
---|
| 522 | LWIP_UNUSED_ARG(inner_conn); /* for LWIP_NOASSERT */
|
---|
| 523 | if (conn) {
|
---|
| 524 | LWIP_ASSERT("pcb mismatch", conn->inner_conn == inner_conn);
|
---|
| 525 | /* check if there's unreceived rx data */
|
---|
| 526 | if (conn->state) {
|
---|
| 527 | altcp_mbedtls_state_t *state = (altcp_mbedtls_state_t *)conn->state;
|
---|
| 528 | /* try to send more if we failed before */
|
---|
| 529 | mbedtls_ssl_flush_output(&state->ssl_context);
|
---|
| 530 | if (altcp_mbedtls_handle_rx_appldata(conn, state) == ERR_ABRT) {
|
---|
| 531 | return ERR_ABRT;
|
---|
| 532 | }
|
---|
| 533 | }
|
---|
| 534 | if (conn->poll) {
|
---|
| 535 | return conn->poll(conn->arg, conn);
|
---|
| 536 | }
|
---|
| 537 | }
|
---|
| 538 | return ERR_OK;
|
---|
| 539 | }
|
---|
| 540 |
|
---|
| 541 | static void
|
---|
| 542 | altcp_mbedtls_lower_err(void *arg, err_t err)
|
---|
| 543 | {
|
---|
| 544 | struct altcp_pcb *conn = (struct altcp_pcb *)arg;
|
---|
| 545 | if (conn) {
|
---|
| 546 | conn->inner_conn = NULL; /* already freed */
|
---|
| 547 | if (conn->err) {
|
---|
| 548 | conn->err(conn->arg, err);
|
---|
| 549 | }
|
---|
| 550 | altcp_free(conn);
|
---|
| 551 | }
|
---|
| 552 | }
|
---|
| 553 |
|
---|
| 554 | /* setup functions */
|
---|
| 555 |
|
---|
| 556 | static void
|
---|
| 557 | altcp_mbedtls_remove_callbacks(struct altcp_pcb *inner_conn)
|
---|
| 558 | {
|
---|
| 559 | altcp_arg(inner_conn, NULL);
|
---|
| 560 | altcp_recv(inner_conn, NULL);
|
---|
| 561 | altcp_sent(inner_conn, NULL);
|
---|
| 562 | altcp_err(inner_conn, NULL);
|
---|
| 563 | altcp_poll(inner_conn, NULL, inner_conn->pollinterval);
|
---|
| 564 | }
|
---|
| 565 |
|
---|
| 566 | static void
|
---|
| 567 | altcp_mbedtls_setup_callbacks(struct altcp_pcb *conn, struct altcp_pcb *inner_conn)
|
---|
| 568 | {
|
---|
| 569 | altcp_arg(inner_conn, conn);
|
---|
| 570 | altcp_recv(inner_conn, altcp_mbedtls_lower_recv);
|
---|
| 571 | altcp_sent(inner_conn, altcp_mbedtls_lower_sent);
|
---|
| 572 | altcp_err(inner_conn, altcp_mbedtls_lower_err);
|
---|
| 573 | /* tcp_poll is set when interval is set by application */
|
---|
| 574 | /* listen is set totally different :-) */
|
---|
| 575 | }
|
---|
| 576 |
|
---|
| 577 | static err_t
|
---|
| 578 | altcp_mbedtls_setup(void *conf, struct altcp_pcb *conn, struct altcp_pcb *inner_conn)
|
---|
| 579 | {
|
---|
| 580 | int ret;
|
---|
| 581 | struct altcp_tls_config *config = (struct altcp_tls_config *)conf;
|
---|
| 582 | altcp_mbedtls_state_t *state;
|
---|
| 583 | if (!conf) {
|
---|
| 584 | return ERR_ARG;
|
---|
| 585 | }
|
---|
| 586 | LWIP_ASSERT("invalid inner_conn", conn != inner_conn);
|
---|
| 587 |
|
---|
| 588 | /* allocate mbedtls context */
|
---|
| 589 | state = altcp_mbedtls_alloc(conf);
|
---|
| 590 | if (state == NULL) {
|
---|
| 591 | return ERR_MEM;
|
---|
| 592 | }
|
---|
| 593 | /* initialize mbedtls context: */
|
---|
| 594 | mbedtls_ssl_init(&state->ssl_context);
|
---|
| 595 | ret = mbedtls_ssl_setup(&state->ssl_context, &config->conf);
|
---|
| 596 | if (ret != 0) {
|
---|
| 597 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("mbedtls_ssl_setup failed\n"));
|
---|
| 598 | /* @todo: convert 'ret' to err_t */
|
---|
| 599 | altcp_mbedtls_free(conf, state);
|
---|
| 600 | return ERR_MEM;
|
---|
| 601 | }
|
---|
| 602 | /* tell mbedtls about our I/O functions */
|
---|
| 603 | mbedtls_ssl_set_bio(&state->ssl_context, conn, altcp_mbedtls_bio_send, altcp_mbedtls_bio_recv, NULL);
|
---|
| 604 |
|
---|
| 605 | altcp_mbedtls_setup_callbacks(conn, inner_conn);
|
---|
| 606 | conn->inner_conn = inner_conn;
|
---|
| 607 | conn->fns = &altcp_mbedtls_functions;
|
---|
| 608 | conn->state = state;
|
---|
| 609 | return ERR_OK;
|
---|
| 610 | }
|
---|
| 611 |
|
---|
| 612 | struct altcp_pcb *
|
---|
| 613 | altcp_tls_wrap(struct altcp_tls_config *config, struct altcp_pcb *inner_pcb)
|
---|
| 614 | {
|
---|
| 615 | struct altcp_pcb *ret;
|
---|
| 616 | if (inner_pcb == NULL) {
|
---|
| 617 | return NULL;
|
---|
| 618 | }
|
---|
| 619 | ret = altcp_alloc();
|
---|
| 620 | if (ret != NULL) {
|
---|
| 621 | if (altcp_mbedtls_setup(config, ret, inner_pcb) != ERR_OK) {
|
---|
| 622 | altcp_free(ret);
|
---|
| 623 | return NULL;
|
---|
| 624 | }
|
---|
| 625 | }
|
---|
| 626 | return ret;
|
---|
| 627 | }
|
---|
| 628 |
|
---|
| 629 | void *
|
---|
| 630 | altcp_tls_context(struct altcp_pcb *conn)
|
---|
| 631 | {
|
---|
| 632 | if (conn && conn->state) {
|
---|
| 633 | altcp_mbedtls_state_t *state = (altcp_mbedtls_state_t *)conn->state;
|
---|
| 634 | return &state->ssl_context;
|
---|
| 635 | }
|
---|
| 636 | return NULL;
|
---|
| 637 | }
|
---|
| 638 |
|
---|
| 639 | #if ALTCP_MBEDTLS_DEBUG != LWIP_DBG_OFF
|
---|
| 640 | static void
|
---|
| 641 | altcp_mbedtls_debug(void *ctx, int level, const char *file, int line, const char *str)
|
---|
| 642 | {
|
---|
| 643 | LWIP_UNUSED_ARG(ctx);
|
---|
| 644 | LWIP_UNUSED_ARG(level);
|
---|
| 645 | LWIP_UNUSED_ARG(file);
|
---|
| 646 | LWIP_UNUSED_ARG(line);
|
---|
| 647 | LWIP_UNUSED_ARG(str);
|
---|
| 648 |
|
---|
| 649 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("%s:%04d: %s", file, line, str));
|
---|
| 650 | }
|
---|
| 651 | #endif
|
---|
| 652 |
|
---|
| 653 | #ifndef ALTCP_MBEDTLS_RNG_FN
|
---|
| 654 | /** ATTENTION: It is *really* important to *NOT* use this dummy RNG in production code!!!! */
|
---|
| 655 | static int
|
---|
| 656 | dummy_rng(void *ctx, unsigned char *buffer, size_t len)
|
---|
| 657 | {
|
---|
| 658 | static size_t ctr;
|
---|
| 659 | size_t i;
|
---|
| 660 | LWIP_UNUSED_ARG(ctx);
|
---|
| 661 | for (i = 0; i < len; i++) {
|
---|
| 662 | buffer[i] = (unsigned char)++ctr;
|
---|
| 663 | }
|
---|
| 664 | return 0;
|
---|
| 665 | }
|
---|
| 666 | #define ALTCP_MBEDTLS_RNG_FN dummy_rng
|
---|
| 667 | #endif /* ALTCP_MBEDTLS_RNG_FN */
|
---|
| 668 |
|
---|
| 669 | /** Create new TLS configuration
|
---|
| 670 | * ATTENTION: Server certificate and private key have to be added outside this function!
|
---|
| 671 | */
|
---|
| 672 | static struct altcp_tls_config *
|
---|
| 673 | altcp_tls_create_config(int is_server, int have_cert, int have_pkey, int have_ca)
|
---|
| 674 | {
|
---|
| 675 | size_t sz;
|
---|
| 676 | int ret;
|
---|
| 677 | struct altcp_tls_config *conf;
|
---|
| 678 | mbedtls_x509_crt *mem;
|
---|
| 679 |
|
---|
| 680 | if (TCP_WND < MBEDTLS_SSL_MAX_CONTENT_LEN) {
|
---|
| 681 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG|LWIP_DBG_LEVEL_SERIOUS,
|
---|
| 682 | ("altcp_tls: TCP_WND is smaller than the RX decryption buffer, connection RX might stall!\n"));
|
---|
| 683 | }
|
---|
| 684 |
|
---|
| 685 | altcp_mbedtls_mem_init();
|
---|
| 686 |
|
---|
| 687 | sz = sizeof(struct altcp_tls_config);
|
---|
| 688 | if (have_cert) {
|
---|
| 689 | sz += sizeof(mbedtls_x509_crt);
|
---|
| 690 | }
|
---|
| 691 | if (have_ca) {
|
---|
| 692 | sz += sizeof(mbedtls_x509_crt);
|
---|
| 693 | }
|
---|
| 694 | if (have_pkey) {
|
---|
| 695 | sz += sizeof(mbedtls_pk_context);
|
---|
| 696 | }
|
---|
| 697 |
|
---|
| 698 | conf = (struct altcp_tls_config *)altcp_mbedtls_alloc_config(sz);
|
---|
| 699 | if (conf == NULL) {
|
---|
| 700 | return NULL;
|
---|
| 701 | }
|
---|
| 702 | mem = (mbedtls_x509_crt *)(conf + 1);
|
---|
| 703 | if (have_cert) {
|
---|
| 704 | conf->cert = mem;
|
---|
| 705 | mem++;
|
---|
| 706 | }
|
---|
| 707 | if (have_ca) {
|
---|
| 708 | conf->ca = mem;
|
---|
| 709 | mem++;
|
---|
| 710 | }
|
---|
| 711 | if (have_pkey) {
|
---|
| 712 | conf->pkey = (mbedtls_pk_context *)mem;
|
---|
| 713 | }
|
---|
| 714 |
|
---|
| 715 | mbedtls_ssl_config_init(&conf->conf);
|
---|
| 716 | mbedtls_entropy_init(&conf->entropy);
|
---|
| 717 | mbedtls_ctr_drbg_init(&conf->ctr_drbg);
|
---|
| 718 |
|
---|
| 719 | /* Seed the RNG */
|
---|
| 720 | ret = mbedtls_ctr_drbg_seed(&conf->ctr_drbg, ALTCP_MBEDTLS_RNG_FN, &conf->entropy, ALTCP_MBEDTLS_ENTROPY_PTR, ALTCP_MBEDTLS_ENTROPY_LEN);
|
---|
| 721 | if (ret != 0) {
|
---|
| 722 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("mbedtls_ctr_drbg_seed failed: %d\n", ret));
|
---|
| 723 | altcp_mbedtls_free_config(conf);
|
---|
| 724 | return NULL;
|
---|
| 725 | }
|
---|
| 726 |
|
---|
| 727 | /* Setup ssl context (@todo: what's different for a client here? -> might better be done on listen/connect) */
|
---|
| 728 | ret = mbedtls_ssl_config_defaults(&conf->conf, is_server ? MBEDTLS_SSL_IS_SERVER : MBEDTLS_SSL_IS_CLIENT,
|
---|
| 729 | MBEDTLS_SSL_TRANSPORT_STREAM, MBEDTLS_SSL_PRESET_DEFAULT);
|
---|
| 730 | if (ret != 0) {
|
---|
| 731 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("mbedtls_ssl_config_defaults failed: %d\n", ret));
|
---|
| 732 | altcp_mbedtls_free_config(conf);
|
---|
| 733 | return NULL;
|
---|
| 734 | }
|
---|
| 735 | mbedtls_ssl_conf_authmode(&conf->conf, MBEDTLS_SSL_VERIFY_OPTIONAL);
|
---|
| 736 |
|
---|
| 737 | mbedtls_ssl_conf_rng(&conf->conf, mbedtls_ctr_drbg_random, &conf->ctr_drbg);
|
---|
| 738 | #if ALTCP_MBEDTLS_DEBUG != LWIP_DBG_OFF
|
---|
| 739 | mbedtls_ssl_conf_dbg(&conf->conf, altcp_mbedtls_debug, stdout);
|
---|
| 740 | #endif
|
---|
| 741 | #if defined(MBEDTLS_SSL_CACHE_C) && ALTCP_MBEDTLS_SESSION_CACHE_TIMEOUT_SECONDS
|
---|
| 742 | mbedtls_ssl_conf_session_cache(&conf->conf, &conf->cache, mbedtls_ssl_cache_get, mbedtls_ssl_cache_set);
|
---|
| 743 | mbedtls_ssl_cache_set_timeout(&conf->cache, 30);
|
---|
| 744 | mbedtls_ssl_cache_set_max_entries(&conf->cache, 30);
|
---|
| 745 | #endif
|
---|
| 746 |
|
---|
| 747 | return conf;
|
---|
| 748 | }
|
---|
| 749 |
|
---|
| 750 | /** Create new TLS configuration
|
---|
| 751 | * This is a suboptimal version that gets the encrypted private key and its password,
|
---|
| 752 | * as well as the server certificate.
|
---|
| 753 | */
|
---|
| 754 | struct altcp_tls_config *
|
---|
| 755 | altcp_tls_create_config_server_privkey_cert(const u8_t *privkey, size_t privkey_len,
|
---|
| 756 | const u8_t *privkey_pass, size_t privkey_pass_len,
|
---|
| 757 | const u8_t *cert, size_t cert_len)
|
---|
| 758 | {
|
---|
| 759 | int ret;
|
---|
| 760 | mbedtls_x509_crt *srvcert;
|
---|
| 761 | mbedtls_pk_context *pkey;
|
---|
| 762 | struct altcp_tls_config *conf = altcp_tls_create_config(1, 1, 1, 0);
|
---|
| 763 | if (conf == NULL) {
|
---|
| 764 | return NULL;
|
---|
| 765 | }
|
---|
| 766 |
|
---|
| 767 | srvcert = conf->cert;
|
---|
| 768 | mbedtls_x509_crt_init(srvcert);
|
---|
| 769 |
|
---|
| 770 | pkey = conf->pkey;
|
---|
| 771 | mbedtls_pk_init(pkey);
|
---|
| 772 |
|
---|
| 773 | /* Load the certificates and private key */
|
---|
| 774 | ret = mbedtls_x509_crt_parse(srvcert, cert, cert_len);
|
---|
| 775 | if (ret != 0) {
|
---|
| 776 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("mbedtls_x509_crt_parse failed: %d\n", ret));
|
---|
| 777 | altcp_mbedtls_free_config(conf);
|
---|
| 778 | return NULL;
|
---|
| 779 | }
|
---|
| 780 |
|
---|
| 781 | ret = mbedtls_pk_parse_key(pkey, (const unsigned char *) privkey, privkey_len, privkey_pass, privkey_pass_len);
|
---|
| 782 | if (ret != 0) {
|
---|
| 783 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("mbedtls_pk_parse_public_key failed: %d\n", ret));
|
---|
| 784 | mbedtls_x509_crt_free(srvcert);
|
---|
| 785 | altcp_mbedtls_free_config(conf);
|
---|
| 786 | return NULL;
|
---|
| 787 | }
|
---|
| 788 |
|
---|
| 789 | mbedtls_ssl_conf_ca_chain(&conf->conf, srvcert->next, NULL);
|
---|
| 790 | ret = mbedtls_ssl_conf_own_cert(&conf->conf, srvcert, pkey);
|
---|
| 791 | if (ret != 0) {
|
---|
| 792 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("mbedtls_ssl_conf_own_cert failed: %d\n", ret));
|
---|
| 793 | mbedtls_x509_crt_free(srvcert);
|
---|
| 794 | mbedtls_pk_free(pkey);
|
---|
| 795 | altcp_mbedtls_free_config(conf);
|
---|
| 796 | return NULL;
|
---|
| 797 | }
|
---|
| 798 | return conf;
|
---|
| 799 | }
|
---|
| 800 |
|
---|
| 801 | static struct altcp_tls_config *
|
---|
| 802 | altcp_tls_create_config_client_common(const u8_t *ca, size_t ca_len, int is_2wayauth)
|
---|
| 803 | {
|
---|
| 804 | int ret;
|
---|
| 805 | struct altcp_tls_config *conf = altcp_tls_create_config(0, is_2wayauth, is_2wayauth, ca != NULL);
|
---|
| 806 | if (conf == NULL) {
|
---|
| 807 | return NULL;
|
---|
| 808 | }
|
---|
| 809 |
|
---|
| 810 | /* Initialize the CA certificate if provided
|
---|
| 811 | * CA certificate is optional (to save memory) but recommended for production environment
|
---|
| 812 | * Without CA certificate, connection will be prone to man-in-the-middle attacks */
|
---|
| 813 | if (ca) {
|
---|
| 814 | mbedtls_x509_crt_init(conf->ca);
|
---|
| 815 | ret = mbedtls_x509_crt_parse(conf->ca, ca, ca_len);
|
---|
| 816 | if (ret != 0) {
|
---|
| 817 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("mbedtls_x509_crt_parse ca failed: %d 0x%x", ret, -1*ret));
|
---|
| 818 | altcp_mbedtls_free_config(conf);
|
---|
| 819 | return NULL;
|
---|
| 820 | }
|
---|
| 821 |
|
---|
| 822 | mbedtls_ssl_conf_ca_chain(&conf->conf, conf->ca, NULL);
|
---|
| 823 | }
|
---|
| 824 | return conf;
|
---|
| 825 | }
|
---|
| 826 |
|
---|
| 827 | struct altcp_tls_config *
|
---|
| 828 | altcp_tls_create_config_client(const u8_t *ca, size_t ca_len)
|
---|
| 829 | {
|
---|
| 830 | return altcp_tls_create_config_client_common(ca, ca_len, 0);
|
---|
| 831 | }
|
---|
| 832 |
|
---|
| 833 | struct altcp_tls_config *
|
---|
| 834 | altcp_tls_create_config_client_2wayauth(const u8_t *ca, size_t ca_len, const u8_t *privkey, size_t privkey_len,
|
---|
| 835 | const u8_t *privkey_pass, size_t privkey_pass_len,
|
---|
| 836 | const u8_t *cert, size_t cert_len)
|
---|
| 837 | {
|
---|
| 838 | int ret;
|
---|
| 839 | struct altcp_tls_config *conf;
|
---|
| 840 |
|
---|
| 841 | if (!cert || !privkey) {
|
---|
| 842 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("altcp_tls_create_config_client_2wayauth: certificate and priv key required"));
|
---|
| 843 | return NULL;
|
---|
| 844 | }
|
---|
| 845 |
|
---|
| 846 | conf = altcp_tls_create_config_client_common(ca, ca_len, 1);
|
---|
| 847 | if (conf == NULL) {
|
---|
| 848 | return NULL;
|
---|
| 849 | }
|
---|
| 850 |
|
---|
| 851 | /* Initialize the client certificate and corresponding private key */
|
---|
| 852 | mbedtls_x509_crt_init(conf->cert);
|
---|
| 853 | ret = mbedtls_x509_crt_parse(conf->cert, cert, cert_len);
|
---|
| 854 | if (ret != 0) {
|
---|
| 855 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("mbedtls_x509_crt_parse cert failed: %d 0x%x", ret, -1*ret));
|
---|
| 856 | altcp_mbedtls_free_config(conf->cert);
|
---|
| 857 | return NULL;
|
---|
| 858 | }
|
---|
| 859 |
|
---|
| 860 | mbedtls_pk_init(conf->pkey);
|
---|
| 861 | ret = mbedtls_pk_parse_key(conf->pkey, privkey, privkey_len, privkey_pass, privkey_pass_len);
|
---|
| 862 | if (ret != 0) {
|
---|
| 863 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("mbedtls_pk_parse_key failed: %d 0x%x", ret, -1*ret));
|
---|
| 864 | altcp_mbedtls_free_config(conf);
|
---|
| 865 | return NULL;
|
---|
| 866 | }
|
---|
| 867 |
|
---|
| 868 | ret = mbedtls_ssl_conf_own_cert(&conf->conf, conf->cert, conf->pkey);
|
---|
| 869 | if (ret != 0) {
|
---|
| 870 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("mbedtls_ssl_conf_own_cert failed: %d 0x%x", ret, -1*ret));
|
---|
| 871 | altcp_mbedtls_free_config(conf);
|
---|
| 872 | return NULL;
|
---|
| 873 | }
|
---|
| 874 |
|
---|
| 875 | return conf;
|
---|
| 876 | }
|
---|
| 877 |
|
---|
| 878 | void
|
---|
| 879 | altcp_tls_free_config(struct altcp_tls_config *conf)
|
---|
| 880 | {
|
---|
| 881 | if (conf->pkey) {
|
---|
| 882 | mbedtls_pk_free(conf->pkey);
|
---|
| 883 | }
|
---|
| 884 | if (conf->cert) {
|
---|
| 885 | mbedtls_x509_crt_free(conf->cert);
|
---|
| 886 | }
|
---|
| 887 | if (conf->ca) {
|
---|
| 888 | mbedtls_x509_crt_free(conf->ca);
|
---|
| 889 | }
|
---|
| 890 | altcp_mbedtls_free_config(conf);
|
---|
| 891 | }
|
---|
| 892 |
|
---|
| 893 | /* "virtual" functions */
|
---|
| 894 | static void
|
---|
| 895 | altcp_mbedtls_set_poll(struct altcp_pcb *conn, u8_t interval)
|
---|
| 896 | {
|
---|
| 897 | if (conn != NULL) {
|
---|
| 898 | altcp_poll(conn->inner_conn, altcp_mbedtls_lower_poll, interval);
|
---|
| 899 | }
|
---|
| 900 | }
|
---|
| 901 |
|
---|
| 902 | static void
|
---|
| 903 | altcp_mbedtls_recved(struct altcp_pcb *conn, u16_t len)
|
---|
| 904 | {
|
---|
| 905 | u16_t lower_recved;
|
---|
| 906 | altcp_mbedtls_state_t *state;
|
---|
| 907 | if (conn == NULL) {
|
---|
| 908 | return;
|
---|
| 909 | }
|
---|
| 910 | state = (altcp_mbedtls_state_t *)conn->state;
|
---|
| 911 | if (state == NULL) {
|
---|
| 912 | return;
|
---|
| 913 | }
|
---|
| 914 | if (!(state->flags & ALTCP_MBEDTLS_FLAGS_HANDSHAKE_DONE)) {
|
---|
| 915 | return;
|
---|
| 916 | }
|
---|
| 917 | lower_recved = len;
|
---|
| 918 | if (lower_recved > state->rx_passed_unrecved) {
|
---|
| 919 | LWIP_DEBUGF(ALTCP_MBEDTLS_DEBUG, ("bogus recved count (len > state->rx_passed_unrecved / %d / %d)",
|
---|
| 920 | len, state->rx_passed_unrecved));
|
---|
| 921 | lower_recved = (u16_t)state->rx_passed_unrecved;
|
---|
| 922 | }
|
---|
| 923 | state->rx_passed_unrecved -= lower_recved;
|
---|
| 924 |
|
---|
| 925 | altcp_recved(conn->inner_conn, lower_recved);
|
---|
| 926 | }
|
---|
| 927 |
|
---|
| 928 | static err_t
|
---|
| 929 | altcp_mbedtls_connect(struct altcp_pcb *conn, const ip_addr_t *ipaddr, u16_t port, altcp_connected_fn connected)
|
---|
| 930 | {
|
---|
| 931 | if (conn == NULL) {
|
---|
| 932 | return ERR_VAL;
|
---|
| 933 | }
|
---|
| 934 | conn->connected = connected;
|
---|
| 935 | return altcp_connect(conn->inner_conn, ipaddr, port, altcp_mbedtls_lower_connected);
|
---|
| 936 | }
|
---|
| 937 |
|
---|
| 938 | static struct altcp_pcb *
|
---|
| 939 | altcp_mbedtls_listen(struct altcp_pcb *conn, u8_t backlog, err_t *err)
|
---|
| 940 | {
|
---|
| 941 | struct altcp_pcb *lpcb;
|
---|
| 942 | if (conn == NULL) {
|
---|
| 943 | return NULL;
|
---|
| 944 | }
|
---|
| 945 | lpcb = altcp_listen_with_backlog_and_err(conn->inner_conn, backlog, err);
|
---|
| 946 | if (lpcb != NULL) {
|
---|
| 947 | conn->inner_conn = lpcb;
|
---|
| 948 | altcp_accept(lpcb, altcp_mbedtls_lower_accept);
|
---|
| 949 | return conn;
|
---|
| 950 | }
|
---|
| 951 | return NULL;
|
---|
| 952 | }
|
---|
| 953 |
|
---|
| 954 | static void
|
---|
| 955 | altcp_mbedtls_abort(struct altcp_pcb *conn)
|
---|
| 956 | {
|
---|
| 957 | if (conn != NULL) {
|
---|
| 958 | altcp_abort(conn->inner_conn);
|
---|
| 959 | }
|
---|
| 960 | }
|
---|
| 961 |
|
---|
| 962 | static err_t
|
---|
| 963 | altcp_mbedtls_close(struct altcp_pcb *conn)
|
---|
| 964 | {
|
---|
| 965 | struct altcp_pcb *inner_conn;
|
---|
| 966 | if (conn == NULL) {
|
---|
| 967 | return ERR_VAL;
|
---|
| 968 | }
|
---|
| 969 | inner_conn = conn->inner_conn;
|
---|
| 970 | if (inner_conn) {
|
---|
| 971 | err_t err;
|
---|
| 972 | altcp_poll_fn oldpoll = inner_conn->poll;
|
---|
| 973 | altcp_mbedtls_remove_callbacks(conn->inner_conn);
|
---|
| 974 | err = altcp_close(conn->inner_conn);
|
---|
| 975 | if (err != ERR_OK) {
|
---|
| 976 | /* not closed, set up all callbacks again */
|
---|
| 977 | altcp_mbedtls_setup_callbacks(conn, inner_conn);
|
---|
| 978 | /* poll callback is not included in the above */
|
---|
| 979 | altcp_poll(inner_conn, oldpoll, inner_conn->pollinterval);
|
---|
| 980 | return err;
|
---|
| 981 | }
|
---|
| 982 | conn->inner_conn = NULL;
|
---|
| 983 | }
|
---|
| 984 | altcp_free(conn);
|
---|
| 985 | return ERR_OK;
|
---|
| 986 | }
|
---|
| 987 |
|
---|
| 988 | /** Allow caller of altcp_write() to limit to negotiated chunk size
|
---|
| 989 | * or remaining sndbuf space of inner_conn.
|
---|
| 990 | */
|
---|
| 991 | static u16_t
|
---|
| 992 | altcp_mbedtls_sndbuf(struct altcp_pcb *conn)
|
---|
| 993 | {
|
---|
| 994 | if (conn) {
|
---|
| 995 | altcp_mbedtls_state_t *state;
|
---|
| 996 | state = (altcp_mbedtls_state_t*)conn->state;
|
---|
| 997 | if (!state || !(state->flags & ALTCP_MBEDTLS_FLAGS_HANDSHAKE_DONE)) {
|
---|
| 998 | return 0;
|
---|
| 999 | }
|
---|
| 1000 | if (conn->inner_conn) {
|
---|
| 1001 | u16_t sndbuf = altcp_sndbuf(conn->inner_conn);
|
---|
| 1002 | /* Take care of record header, IV, AuthTag */
|
---|
| 1003 | int ssl_expan = mbedtls_ssl_get_record_expansion(&state->ssl_context);
|
---|
| 1004 | if (ssl_expan > 0) {
|
---|
| 1005 | size_t ssl_added = (u16_t)LWIP_MIN(ssl_expan, 0xFFFF);
|
---|
| 1006 | /* internal sndbuf smaller than our offset */
|
---|
| 1007 | if (ssl_added < sndbuf) {
|
---|
| 1008 | size_t max_len = 0xFFFF;
|
---|
| 1009 | size_t ret;
|
---|
| 1010 | #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
|
---|
| 1011 | /* @todo: adjust ssl_added to real value related to negociated cipher */
|
---|
| 1012 | size_t max_frag_len = mbedtls_ssl_get_max_frag_len(&state->ssl_context);
|
---|
| 1013 | max_len = LWIP_MIN(max_frag_len, max_len);
|
---|
| 1014 | #endif
|
---|
| 1015 | /* Adjust sndbuf of inner_conn with what added by SSL */
|
---|
| 1016 | ret = LWIP_MIN(sndbuf - ssl_added, max_len);
|
---|
| 1017 | LWIP_ASSERT("sndbuf overflow", ret <= 0xFFFF);
|
---|
| 1018 | return (u16_t)ret;
|
---|
| 1019 | }
|
---|
| 1020 | }
|
---|
| 1021 | }
|
---|
| 1022 | }
|
---|
| 1023 | /* fallback: use sendbuf of the inner connection */
|
---|
| 1024 | return altcp_default_sndbuf(conn);
|
---|
| 1025 | }
|
---|
| 1026 |
|
---|
| 1027 | /** Write data to a TLS connection. Calls into mbedTLS, which in turn calls into
|
---|
| 1028 | * @ref altcp_mbedtls_bio_send() to send the encrypted data
|
---|
| 1029 | */
|
---|
| 1030 | static err_t
|
---|
| 1031 | altcp_mbedtls_write(struct altcp_pcb *conn, const void *dataptr, u16_t len, u8_t apiflags)
|
---|
| 1032 | {
|
---|
| 1033 | int ret;
|
---|
| 1034 | altcp_mbedtls_state_t *state;
|
---|
| 1035 |
|
---|
| 1036 | LWIP_UNUSED_ARG(apiflags);
|
---|
| 1037 |
|
---|
| 1038 | if (conn == NULL) {
|
---|
| 1039 | return ERR_VAL;
|
---|
| 1040 | }
|
---|
| 1041 |
|
---|
| 1042 | state = (altcp_mbedtls_state_t *)conn->state;
|
---|
| 1043 | if (state == NULL) {
|
---|
| 1044 | /* @todo: which error? */
|
---|
| 1045 | return ERR_CLSD;
|
---|
| 1046 | }
|
---|
| 1047 | if (!(state->flags & ALTCP_MBEDTLS_FLAGS_HANDSHAKE_DONE)) {
|
---|
| 1048 | /* @todo: which error? */
|
---|
| 1049 | return ERR_VAL;
|
---|
| 1050 | }
|
---|
| 1051 |
|
---|
| 1052 | /* HACK: if thre is something left to send, try to flush it and only
|
---|
| 1053 | allow sending more if this succeeded (this is a hack because neither
|
---|
| 1054 | returning 0 nor MBEDTLS_ERR_SSL_WANT_WRITE worked for me) */
|
---|
| 1055 | if (state->ssl_context.out_left) {
|
---|
| 1056 | mbedtls_ssl_flush_output(&state->ssl_context);
|
---|
| 1057 | if (state->ssl_context.out_left) {
|
---|
| 1058 | return ERR_MEM;
|
---|
| 1059 | }
|
---|
| 1060 | }
|
---|
| 1061 | ret = mbedtls_ssl_write(&state->ssl_context, (const unsigned char *)dataptr, len);
|
---|
| 1062 | /* try to send data... */
|
---|
| 1063 | altcp_output(conn->inner_conn);
|
---|
| 1064 | if (ret >= 0) {
|
---|
| 1065 | if (ret == len) {
|
---|
| 1066 | state->flags |= ALTCP_MBEDTLS_FLAGS_APPLDATA_SENT;
|
---|
| 1067 | return ERR_OK;
|
---|
| 1068 | } else {
|
---|
| 1069 | /* @todo/@fixme: assumption: either everything sent or error */
|
---|
| 1070 | LWIP_ASSERT("ret <= 0", 0);
|
---|
| 1071 | return ERR_MEM;
|
---|
| 1072 | }
|
---|
| 1073 | } else {
|
---|
| 1074 | if (ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
|
---|
| 1075 | /* @todo: convert error to err_t */
|
---|
| 1076 | return ERR_MEM;
|
---|
| 1077 | }
|
---|
| 1078 | LWIP_ASSERT("unhandled error", 0);
|
---|
| 1079 | return ERR_VAL;
|
---|
| 1080 | }
|
---|
| 1081 | }
|
---|
| 1082 |
|
---|
| 1083 | /** Send callback function called from mbedtls (set via mbedtls_ssl_set_bio)
|
---|
| 1084 | * This function is either called during handshake or when sending application
|
---|
| 1085 | * data via @ref altcp_mbedtls_write (or altcp_write)
|
---|
| 1086 | */
|
---|
| 1087 | static int
|
---|
| 1088 | altcp_mbedtls_bio_send(void *ctx, const unsigned char *dataptr, size_t size)
|
---|
| 1089 | {
|
---|
| 1090 | struct altcp_pcb *conn = (struct altcp_pcb *) ctx;
|
---|
| 1091 | int written = 0;
|
---|
| 1092 | size_t size_left = size;
|
---|
| 1093 | u8_t apiflags = TCP_WRITE_FLAG_COPY;
|
---|
| 1094 |
|
---|
| 1095 | LWIP_ASSERT("conn != NULL", conn != NULL);
|
---|
| 1096 | if ((conn == NULL) || (conn->inner_conn == NULL)) {
|
---|
| 1097 | return MBEDTLS_ERR_NET_INVALID_CONTEXT;
|
---|
| 1098 | }
|
---|
| 1099 |
|
---|
| 1100 | while (size_left) {
|
---|
| 1101 | u16_t write_len = (u16_t)LWIP_MIN(size_left, 0xFFFF);
|
---|
| 1102 | err_t err = altcp_write(conn->inner_conn, (const void *)dataptr, write_len, apiflags);
|
---|
| 1103 | if (err == ERR_OK) {
|
---|
| 1104 | written += write_len;
|
---|
| 1105 | size_left -= write_len;
|
---|
| 1106 | } else if (err == ERR_MEM) {
|
---|
| 1107 | if (written) {
|
---|
| 1108 | return written;
|
---|
| 1109 | }
|
---|
| 1110 | return 0; /* MBEDTLS_ERR_SSL_WANT_WRITE; */
|
---|
| 1111 | } else {
|
---|
| 1112 | LWIP_ASSERT("tls_write, tcp_write: err != ERR MEM", 0);
|
---|
| 1113 | /* @todo: return MBEDTLS_ERR_NET_CONN_RESET or MBEDTLS_ERR_NET_SEND_FAILED */
|
---|
| 1114 | return MBEDTLS_ERR_NET_SEND_FAILED;
|
---|
| 1115 | }
|
---|
| 1116 | }
|
---|
| 1117 | return written;
|
---|
| 1118 | }
|
---|
| 1119 |
|
---|
| 1120 | static u16_t
|
---|
| 1121 | altcp_mbedtls_mss(struct altcp_pcb *conn)
|
---|
| 1122 | {
|
---|
| 1123 | if (conn == NULL) {
|
---|
| 1124 | return 0;
|
---|
| 1125 | }
|
---|
| 1126 | /* @todo: LWIP_MIN(mss, mbedtls_ssl_get_max_frag_len()) ? */
|
---|
| 1127 | return altcp_mss(conn->inner_conn);
|
---|
| 1128 | }
|
---|
| 1129 |
|
---|
| 1130 | static void
|
---|
| 1131 | altcp_mbedtls_dealloc(struct altcp_pcb *conn)
|
---|
| 1132 | {
|
---|
| 1133 | /* clean up and free tls state */
|
---|
| 1134 | if (conn) {
|
---|
| 1135 | altcp_mbedtls_state_t *state = (altcp_mbedtls_state_t *)conn->state;
|
---|
| 1136 | if (state) {
|
---|
| 1137 | mbedtls_ssl_free(&state->ssl_context);
|
---|
| 1138 | state->flags = 0;
|
---|
| 1139 | if (state->rx) {
|
---|
| 1140 | /* free leftover (unhandled) rx pbufs */
|
---|
| 1141 | pbuf_free(state->rx);
|
---|
| 1142 | state->rx = NULL;
|
---|
| 1143 | }
|
---|
| 1144 | altcp_mbedtls_free(state->conf, state);
|
---|
| 1145 | conn->state = NULL;
|
---|
| 1146 | }
|
---|
| 1147 | }
|
---|
| 1148 | }
|
---|
| 1149 |
|
---|
| 1150 | const struct altcp_functions altcp_mbedtls_functions = {
|
---|
| 1151 | altcp_mbedtls_set_poll,
|
---|
| 1152 | altcp_mbedtls_recved,
|
---|
| 1153 | altcp_default_bind,
|
---|
| 1154 | altcp_mbedtls_connect,
|
---|
| 1155 | altcp_mbedtls_listen,
|
---|
| 1156 | altcp_mbedtls_abort,
|
---|
| 1157 | altcp_mbedtls_close,
|
---|
| 1158 | altcp_default_shutdown,
|
---|
| 1159 | altcp_mbedtls_write,
|
---|
| 1160 | altcp_default_output,
|
---|
| 1161 | altcp_mbedtls_mss,
|
---|
| 1162 | altcp_mbedtls_sndbuf,
|
---|
| 1163 | altcp_default_sndqueuelen,
|
---|
| 1164 | altcp_default_nagle_disable,
|
---|
| 1165 | altcp_default_nagle_enable,
|
---|
| 1166 | altcp_default_nagle_disabled,
|
---|
| 1167 | altcp_default_setprio,
|
---|
| 1168 | altcp_mbedtls_dealloc,
|
---|
| 1169 | altcp_default_get_tcp_addrinfo,
|
---|
| 1170 | altcp_default_get_ip,
|
---|
| 1171 | altcp_default_get_port
|
---|
| 1172 | #ifdef LWIP_DEBUG
|
---|
| 1173 | , altcp_default_dbg_get_tcp_state
|
---|
| 1174 | #endif
|
---|
| 1175 | };
|
---|
| 1176 |
|
---|
| 1177 | #endif /* LWIP_ALTCP_TLS && LWIP_ALTCP_TLS_MBEDTLS */
|
---|
| 1178 | #endif /* LWIP_ALTCP */
|
---|